Fair Value Measurements - Unobservable Reconciliation (Details) $ in Thousands	9 Months Ended
	Oct. 31, 2025 USD ($)
Redeemable Convertible Preferred Stock Warrant Liability
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance as of January 31, 2025	$ 427
Change in fair value	510
Reclassification to equity	(937)
Balance as of October 31, 2025	0
Embedded Derivative Liability
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance as of January 31, 2025	59,820
Change in fair value	(25,150)
Reclassification to equity	(34,670)
Balance as of October 31, 2025	0
SAFEs
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance as of January 31, 2025	0
Additions in the period	127,300
Change in fair value	68,975
Reclassification to equity	0
Conversion	(196,275)
Balance as of October 31, 2025	0
Common stock warrants
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance as of January 31, 2025	0
Additions in the period	27,700
Change in fair value	2,706
Reclassification to equity	(30,406)
Conversion	0
Balance as of October 31, 2025	$ 0

Navan, Inc. 10-Q